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Synthesis of Homogeneous La0.8Sr0.2CrO3 Powders Using an Ultrasonic Spray Pyrolysis Method

  • Kim, Chang-Sam ;
  • Hwang, Seong-Ik ;
  • Kim, Shin-Woo
  • Published : 2007.05.31

Abstract

A process to synthesize $La_{0.8}Sr_{0.2}CrO_3$ (LSC), which is a promising material for use as a separator in a soild oxide fuel cell, is investigated in this study. LSC powders without secondary Phases could be synthesized with ultrasonic spray pyrolysis and a heat treatment at $1200^{\circ}C$ for 20 h; however, it showed an average diameter of $0.6{\mu}m$ with a wide particle size distribution. On the other hand, LSC powders synthesized with spray pyrolysis at $800^{\circ}C$, heat-treated at $900^{\circ}C$ for 5 h, ball-milled and finally heat-treated again at $1200^{\circ}C$ for 20 h showed a smaller average diameter of $0.3{\mu}m$ and narrower size distribution. Very few particles above $0.5{\mu}m$ were found. Thus, a proper combination of the heat treatment and milling process after spray pyrolysis it determined to be very important in synthesizing fine and uniform LSC perovskite powders.

Keywords

Solid oxide fuel cell;$La_{0.8}Sr_{0.2}CrO_3$;Separator;Ultrasonic spray pyrolysis

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